Suction roll



Jan. 11, 1944.

W. H. MILLSPAUGH SUCTION ROLL Filed Jan. 5, 1939 2 Sheets-Sheet 2 Patented Jan. 11, 1944 I for paper and pulp making and inlsoi-o'i`Vv other industries such asy the its primary purpose is to removeiwatervin? v making from the upper side of a ielt'whe paper is pressed between two relts,va`s'torjexanipl e1in" making heavy papers on a When wet webs of peper aref'caLrriecig"k through presses the water always in and through the telt. With old im presses the water. notwithstanding an tion at the nip on the lower roll o! a pressfg part of the water at least, does not run ofi. accumulation of water limits the speed andfis source of trouble, causing crush.v The press roll overcame these dimculties at the roll. With two ielts the accumulation oi. water at the nip of the plain top roll caused endless trouble vand many devices have been used to ref move such water, fo'r instance plain slice to confine the water to a narrow area. near the roll and cause it to run of! the two edges o! the Y felt into a pit under the machine.' Numerous suction slices have been made Vand used. one exs:v ample being shown in my U. B. Letters Patent" However, even with suction slices y such as shown in the said prior patent the water must accumulate until it reaches and can be 'caught by the suction slide. Inverted box suction press rolls or existing designs have been tried william nunc Catawba :ammonio g '7 applicati :muy s. iosa. sci-in Naziasss w la :angustias:

This inventionv relates to suction il pnferabiyhavincia head foradx1both suctiony rolls 4fis'a sectional end owerftormingmould 'Ilig.'5 is a cross secaticggshowing a suction. more -or l l invention. associatedvwith alowersuction roll, with two i'elts web otpaper between them.

but due to structural limitations and natures'l laws, the water could not be evacuated and a pond was held in the box and perforationsot the sheet to be re-absorbed and also carried throllh` the nip to be thrown out by a centrifugal force or gravity according to speed. f v

The presentinvention has for its object eilec` tually tofremove the water'at the nip by receiving and evacuating the water as expressed and to permit of greater pressures being applied to ,the top roll, yandi as the nip is freed from water and crush, owering and the like is stopped. For this purpose according to the invention, a suction press or top couch roll is provided inter'- nally with a suction box having a smallcapacfity receiving chamber between parallel-longitu- 'v dinal sealing walls or packings contacting with F156 is alview lshowinga modi- 'iied eonstructionyand Flg:-'7 is a section on the IineVlI-Q-VIIjoArmilla.'6.1-` l a y.Referring tothe; drawing tcp couch roll Aaccordiiig@tothe: invention comprises a.l bronze roll. i -[perforated in the usual manner for suctionpr'esses, and it may, as shown',

preferably have affrubber covering 2 in which the holes 2 therein are Valigned with the holes the inner wall of the shell, the ends of the chain;

ber being sealedby heads which contact,- with the shell, the rsuction box vided with a raised portion orrib or.equivalentj` arranged longitudinally of the interiorloi'f-the suce tion box and provided with passages eonrieetirig` the chamber and interior ofthe suctionibxj.

through which water and air can be drawn: The

I in thebronze shell. i Arranged within the shell i is a suction box I which and the innerwall ofthesheli is a narrow longitudinal chamber 4 recessed in or formed between a packing strip or strips I .which may-be of VBabbitt metal or fibre chemically treate'dgor Arubber with tex'- tiles. or wood, or any other suitable'rnaterial. The suction box Vl is provided with aninrnal upstanding rib Ill extending nearly.. the perforated length of theshell, the yrib being provided: with janumber of passages 1 communicating with the interior ofthe box and the chamber l and within `which'arey arranged tubes l caclrprovided at its finner end vwith a head "lfroa spanneror with a the equivalent' such as a vpassage vor slot. The "rib .l -is' of such a height that water drawn into f'thef'interior of the suction box I will be prevented lfrom gathering above the passages 1, or the ends passau" f esmay bcrovidled'witnexrnaliyunf' lgli.

ustment.byijajspennerqffl'hegsuetiongbox may be vided with' a, removableccver .to provide access Muslimen@ en@ fdigranimatic, showing a sucn froll 's'hell' and suctionLz-boxembodying the and suction box embodying the f a t suction press orof the tubes I inserted in the passages. The suction box is provided-with a removable cover l whereby access can readily be gained to the interior of the box to introduce additional passages or tubes or to close some of them if desired. The suction box is constructed to give the water accumulated therein free travel to its extreme end and to a pump for complete drainage of the water from the box.

The passages or tubes l forming communication between the chamber I and the interior of the suction box 3 are of such a number and size that they have but slightly greater carrying capacity for air and water than the amount entering the chamber to the end and purpose of draining the water from the upper side of the upper felt without allowing an accumulation` within the chamber between the sealing strips,

horizontally, with little interference to production.

Or the lower roll l2 may be' a smooth imperforate roll, the two felts with web of paper between them being passed between the two rolls in such manner that an arc oi' the upper roll equal to the overall width of its suction box chamber is covered by the felts. the interior of the chamber of the upper roll being positioned on 1n the approach side of the bite.

ing from the invention to secure this restricted where a pool of water held in the chamber would s be re-absorbed by the felt and paper and carried through the nip, unless sucked away as described.

A roll lI constructed as described may be arranged over a lower smooth imperforate roll to i'orm a suction press assembly with a felt carrying on its under surface a web ot paper adapted to pass between the rolls with the fait in contact with the upper suction roll.

Or, as shown in Fig. 4. a roll I may be used as a couch roll mounted over a paper web-forming mould cylinder III of a paper making machine provided with a felt II travellingv over the cylinder. the upper roll contacting with the felt to exert a regulatable pressure on the felt having a web of paper on the under surface thereof, whereby water is extracted therefrom and the paper web caused to leave the web forming sur` face and to adhere iirxniy to the underside of the said felt which may travel onward to similar umts, the paper web from each adhering to the preceding web.

A roll I constructed as described and as shown in Fig. 5, may also be employed as'the top roll in combination with a lower suction roll I2 provided with a. rubber convering I3 according to the specification of my British Letters Patent No. 457,858. The rolls I and I2 would be oset so that felts I4 and I5 with paper I6 between packing l* containing slots Ib.

The theory of this invention, namely, restricted passages through which water and air pass at lrigh velocity. being understood, various modified constructions may be employed `without departcommunication between the chamber and interior of the vsuction-box, for instance as shown in Figs. 6 and 7, in which the lower chamber comprises two compartments 4*. 4" separated by Some of such constructions may be provided with regulating means to denne the net opening of the passages.

Top and bottom rolls are described. It is to be understood however that the rolls may be arranged in any relation wherein the suction box of this invention lies below the contacting line vwith its co-acting roll, should the rolls coact with their axes on a horizontal plane. A suction roll as described may be used without a coacting roll,

o where water is to be lifted, for example. as a suction roll used to transfer a web of paper from a wire or felt. f

What I claim is:

1. A hollow cylindrical suction press roll, a stationary suction box within the roll and near the lower part of said roll having parallel longitudinal sealing walls and sealing heads at the ends or the walls. said walls Vandv heads contacting with the lower part'ot the inner surface of the roll o and forming a small capacity receiving chamber,

have suillcie'nt lap about the upper roll I so that to the outside of the packings, so that holes communicating with the suction box do not have access to the atmosphere which would reduce the vacuum necessary within the cham-ber and interior of the suction box to lift the water.

The arc over the suction box I'I of the lower roll I2 at theapproach side is not fully covered by the felts so that a large volume of air at low pressure can be drawn into the said lower suction box through the shell perforations with the water flowing from the bite of the two rolls onto the arc of the lower roll which is in communication with the lower suction box, in such manner that gravity, assisted bythe induced air pressure, quickly removes the water from the lower perforated roll surfacel as described in the specification of my said British Letters Patent No.,

457,858. In that invention the felts should run' an upstanding longitudinal rib above said chamber with its top above an adjacent portion of the suction box, said rib being provided with longitudinally spaced restricted passages from the chamber through which water and air can be raised through the top of said rib into the suction box.

` 2. A suction roll press assembly wherein a suction roll according to claim 1 is mounted over a lower suction preasroll between which two felts with a web oi' paper between them may be passed in contact with an arc of the upper press roll corresponding to the overall width of its suction box chamber, the chamber of said upper roll being positioned on the approach side of a plane through the bite and wherein the arc over the suction box of the lower roll at the approach side of a plane through the bite is not fully covered by the felts.

3. A suction press roll provided internally with a stationary suction box within the roll and near the lower part of said' roll having along its lower edge a small capacity receiving chamber between parallel longitudinal sealing walls or packlngs contacting 'with the lower part of the inner wall of theshell, the ends of the chamber beingsealed by,..h'eads which also contact with the shell, the

,b'ox being also provided with a raised portion or 'portions arranged longitudinalLv of the interior of the suction box above said chamber and provided with adiustable passages from the top of the raised portion or portions to the chamber. through which lwater and air can be raised. and a removable cover for the suction box whereby access to said pasages may be had.

4. A suction press roll according to claim 1.

wherein the passages connecting the chamber and interior of the suction box are restricted by the insertion of tubes therein.

5. A suction press assembly wherein a suction roll according to claim 1 is mounted over a lower suction press roii between which two felts with a web oi' paper between them may be passed in contact with an arc of the upper press roll corresponding to the overall width of its suction box chamber, the chamber of the upper roll being 10 positioned on the approach side of a piane through the bite.

WILLIAM HULSE MILLSPAUGH. 

